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Background: The Oberg-Manske-Tonkin (OMT) classification established excellent reliability scores in several validation studies. However, one study published in 2022 found much lower scores in a subanalysis of their sample when very simple anomalies were excluded. Our study assessed the reliability of the OMT among physicians with a different background, all involved in congenital hand anomaly care, and analyzed codes with less agreement.

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Purpose: This study aimed to investigate the relative frequency of congenital upper-limb anomalies (CULAs) in southern Taiwan using the 2020-updated the Oberg, Manske, and Tonkin (OMT) classification system and evaluate the practicality of the new classification system.

Methods: We retrospectively reviewed patients with CULAs from 1987 to 2021 at a referral center in southern Taiwan. All patients were analyzed based on medical records, photographs, and radiographs, and the anomalies were classified according to the 2020 OMT classification system.

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Do Nails and Nubbins Matter? A Comparison of Symbrachydactyly and Transverse Deficiency Phenotypes.

J Hand Surg Am

November 2024

Department of Orthopedic Surgery, University of Minnesota, Minneapolis, MN; Gillette Children's Specialty Healthcare, Saint Paul, MN. Electronic address:

Purpose: Transverse deficiency (TD) and symbrachydactyly may be difficult to distinguish due to shared phenotypes and a lack of pathognomonic features. The 2020 Oberg-Manske-Tonkin classification update modified these anomalies to include "with ectodermal elements" for symbrachydactyly and "without ectodermal elements" for TD as a defining differentiating characteristic. The purpose of this investigation was to characterize ectodermal elements and the level of deficiency and to examine whether ectodermal elements versus the level of deficiency was a greater determining factor for Congenital Upper Limb Differences (CoULD) surgeons making the diagnosis.

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Purpose: A deeper investigation of medical and musculoskeletal conditions in patients with ulnar longitudinal deficiency (ULD) is needed. The association between the severity of the manifestations of ULD in the hands and forearms has not been firmly established. The purpose of this study was to describe the medical and musculoskeletal conditions associated with ULD and examine the relationship between hand and forearm anomalies.

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Article Synopsis
  • Five surgeons evaluated 150 patients with congenital upper limb anomalies using the Oberg-Manske-Tonkin classification system, focusing on the reliability of their assessments.
  • Inter-rater reliability was found to be substantial for commonly distinguishable anomalies (Group 1) but only moderate for other anomalies (Group 2).
  • The study suggests improvements to the classification system to enhance reliability, including clearer instructional guidelines.
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